Brief&colon; The sensor is the intellectualized instrument controlled by single chip processor and adopts the design of intrinsic safety circuit&period; It is applicable to the liquid environment under the coal mine or on the ground with the gas explosion and can continuously detect the carbon monoxide from the main return air in mine&comma; return air in mining area and pipelines&period;The instrument adopts imported sensing elements with the characteristic of high detection sensitivity&comma; good stability&comma; wide measurement range&comma; good compatibility&comma; nonlinear calibration&comma; temperature compensation&comma; infrared parameter setting and digital display and so on&period;